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From: Thomas Gleixner <tglx@linutronix.de>
To: Peter Schneider <pschneider1968@googlemail.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
	x86@kernel.org, stable@vger.kernel.org,
	regressions@lists.linux.dev
Subject: Re: Kernel 6.9 regression: X86: Bogus messages from topology detection
Date: Thu, 30 May 2024 17:53:57 +0200	[thread overview]
Message-ID: <87o78n8fe2.ffs@tglx> (raw)
In-Reply-To: <87r0dj8ls4.ffs@tglx>

On Thu, May 30 2024 at 15:35, Thomas Gleixner wrote:
> On Thu, May 30 2024 at 12:06, Peter Schneider wrote:
> Now the million-dollar question is what unlocks CPUID to read the proper
> value of EAX of leaf 0. All I could come up with is to sprinkle a dozen
> of printks into that code. Updated debug patch below.

Don't bother. Dave pointed out to me that this is unlocked in
early_init_intel() via MSR_IA32_MISC_ENABLE_LIMIT_CPUID...

Let me figure out how to fix that sanely.

Thanks,

        tglx

  reply	other threads:[~2024-05-30 15:54 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-05-27  7:29 Kernel 6.9 regression: X86: Bogus messages from topology detection Peter Schneider
2024-05-27 13:14 ` Thomas Gleixner
2024-05-27 20:49   ` Thomas Gleixner
2024-05-27 21:06   ` Peter Schneider
2024-05-27 21:15     ` Peter Schneider
2024-05-27 21:34       ` Christian Heusel
2024-05-30  8:30       ` Thomas Gleixner
2024-05-30 10:06         ` Peter Schneider
2024-05-30 13:35           ` Thomas Gleixner
2024-05-30 15:53             ` Thomas Gleixner [this message]
2024-05-30 16:24               ` Thomas Gleixner
2024-05-31  6:52                 ` Peter Schneider
2024-05-31  8:33                   ` Thomas Gleixner
2024-05-31  8:42                     ` Thomas Gleixner
2024-05-31  9:41                       ` Peter Schneider
2024-05-31 10:07                         ` Thomas Gleixner
2024-05-31 10:22                           ` Peter Schneider
2024-06-01  7:06                       ` Linux regression tracking (Thorsten Leemhuis)
2024-06-01  7:20                         ` Thomas Gleixner
2024-06-01  7:25                           ` Linux regression tracking (Thorsten Leemhuis)
2024-05-31  8:13                 ` Christian Heusel
2024-05-31  8:16                   ` Christian Heusel
2024-05-31  8:48                     ` Thomas Gleixner
2024-05-31  9:11                       ` Thomas Gleixner
2024-05-31 13:08                         ` Christian Heusel
2024-05-31 13:42                           ` Thomas Gleixner
2024-05-31 14:29                             ` Christian Heusel
2024-05-31 15:25                               ` Thomas Gleixner
2024-05-31 11:06                     ` Thomas Gleixner
2024-05-31 19:02 ` [tip: x86/urgent] x86/topology/intel: Unlock CPUID before evaluating anything tip-bot2 for Thomas Gleixner

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